Harrow



(No Model.)

. O. E. BEMENT.

HARROW. No. 399,731 Patented Mar. 19, 1889.

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CLARENCE E. BEMENT, OF LANSING, MICHIGAN.

HARRCW.

SPECIFICATION forming part of Letters Patent No. 399,731, dated March 19, 1889.

Application filed January 31, 1889. Serial No. 298,210. (Nomodeh) To [oZZ whmn it may concern:

Be it known that I, CLARENCE E. BEMENT, of Lansing, in the county of Ingham, State of Michigan, have invented a new and useful Improvement in Spring-Tooth I-Iarrows, of which the following is a specification.

My invention relates to spring-tooth harrows, and its object is to provide means by which the ordinary curved tooth in a spring tooth harrow can be most securely and tirmly fastened to the framework.

Figure l is a vertical section across the frame-work in the plane of one of the teeth. Fig. 2 is a perspective view of this part of the frame or supporting-beam with the tooth in position therein. Fig. 3 is a perspective View,

on an enlarged scale, of the part of the framework in which the tooth is secured.

My invention is equally fitted for holding curved teeth which are attached to the upper side of the framework and extend out to the rear and downward and teeth which are attached to the underside of the frame and extend forward, then up over the frame, and then backward and down to the ground. The former arrangement is the one shown in the drawings.

B represents a portion of the frame-work crosswise, in which is cut or otherwise formed the gain C, the course of which follows the direction it is desired the tooth should have. The bottom of the gain, as a whole, is slightly convex, and is grooved or corrugated transversely to its lengtlnas shown plainly in Figs. 1 and 3, so as to form thereon what may be termed knife-edge supports or ridges a, which are the only points of contact between the tooth and the framepiece B. There are two of these knife-edge supports, and this is the preferred number.

A flat iron plate, A, and two bolts, 0, which hold the same to the frame-piece, form a clip which completes the fastening. This clip or plate A, at a point between the two ridges a, bears upon the outer face of that portion of the tooth which lies in the gain C, which portion is thus held between the said clip and the transverse knife-edge supports or ridges a. By this means the tooth is most securely held in place without liability to slip or wabble. The bolts 0 pass through holes in the plate A and frame-piece B, located on opposite sides of the gain and so placed that a line extending bet-ween them will be at right angles to the general course of that portion of the tooth which is contained in the gain C. The bolts have conical heads, which it into countersunk holes in the plate A, so as to be flush with the plate, as indicated in Fig. 2. This form of fastening is exceedingly simple, and yet at the same time most effective and durable.

VhatI claim, and desire to secure byLetters Patent, is as follows:

1. A fastening for the curved tooth of a spring-tooth harrow, consisting of a supporting frame-piece provided with a gain to receive the shank of the tooth, which gain has a transversely corrugated or grooved bottom, so as to provide transverse knife-edge supports or ridges a, and a clip arranged to bear upon the outer face of the tooth at a point between the points where the inner face of the tooth meets the said supports a, substantially as described.

2. The combination of the frame -piece, formed with a tooth-receiving gain having a bottom transversely corrugated or grooved, so as to provide the knife-edge supports or ridges a, and a clip formed of the iron plate A, held to the frame-piece and against the tooth by conically-headed bolts fitting in conical counterseats in said plate, substantially as hereinbefore set forth.

In testimony whereof I have hereunto set my hand this 29th day of January, A. D. 1889.

CLARENCE E. BEMENT.

Witnesses:

EFFIE I. E. CROFT, CHARLES F. BURTON. 

